<div id="controls">
  <button id="nsh">Without Native Scrollbar Hiding</button>
  <button id="vpt">Viewport is target</button>
  <br />
  <button id="start">start</button>
</div>
<div id="stage">
  <div id="wrapper" class="element">
    <div class="element">
      <div id="target" class="element">
        <div class="element">
          <input id="input" type="text" />
        </div>
      </div>
    </div>
  </div>
</div>
